fix geometry for PAT

[monttj]

It affects PAT. the gem and me0 geometry should have been removed as well.
These two files were deleted already a way ago.

[cmsbuild]

A new Pull Request was created by @monttj (Tae Jeong Kim) for CMSSW_6_2_X_SLHC.

fix geometry for PAT

It involves the following packages:

Geometry/CommonDetUnit

@civanch, @Dr15Jones, @ianna, @mdhildreth, @cmsbuild, @nclopezo, @Degano, @ktf can you please review it and eventually sign? Thanks.
@ghellwig this is something you requested to watch as well.
You can sign-off by replying to this message having '+1' in the first line of your reply.
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@fratnikov, @mark-grimes you are the release manager for this.
You can merge this pull request by typing 'merge' in the first line of your comment.

[mark-grimes]

merge

Since the two files referenced no longer exist I'll skip the signature from Geometry.